code cleanup for kubectl top

pkg/kubectl/cmd/top/top_node.go

@@ -106,15 +106,9 @@ func NewCmdTopNode(f cmdutil.Factory, o *TopNodeOptions, streams genericclioptio
 		Long:                  topNodeLong,
 		Example:               topNodeExample,
 		Run: func(cmd *cobra.Command, args []string) {
-			if err := o.Complete(f, cmd, args); err != nil {
-				cmdutil.CheckErr(err)
-			}
-			if err := o.Validate(); err != nil {
-				cmdutil.CheckErr(cmdutil.UsageErrorf(cmd, "%v", err))
-			}
-			if err := o.RunTopNode(); err != nil {
-				cmdutil.CheckErr(err)
-			}
+			cmdutil.CheckErr(o.Complete(f, cmd, args))
+			cmdutil.CheckErr(o.Validate())
+			cmdutil.CheckErr(o.RunTopNode())
 		},
 		Aliases: []string{"nodes", "no"},
 	}

pkg/kubectl/cmd/top/top_pod.go

@@ -95,15 +95,9 @@ func NewCmdTopPod(f cmdutil.Factory, o *TopPodOptions, streams genericclioptions
 		Long:                  topPodLong,
 		Example:               topPodExample,
 		Run: func(cmd *cobra.Command, args []string) {
-			if err := o.Complete(f, cmd, args); err != nil {
-				cmdutil.CheckErr(err)
-			}
-			if err := o.Validate(); err != nil {
-				cmdutil.CheckErr(cmdutil.UsageErrorf(cmd, "%v", err))
-			}
-			if err := o.RunTopPod(); err != nil {
-				cmdutil.CheckErr(err)
-			}
+			cmdutil.CheckErr(o.Complete(f, cmd, args))
+			cmdutil.CheckErr(o.Validate())
+			cmdutil.CheckErr(o.RunTopPod())
 		},
 		Aliases: []string{"pods", "po"},
 	}